tools: image: fix node name of signature node in FIT

Both "conf_name" and "sig_name" point to the name of config node.
The latter should be the name of the signature node.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/image-host.c b/tools/image-host.c
index 5e4d690..c60d4ad 100644
--- a/tools/image-host.c
+++ b/tools/image-host.c
@@ -513,7 +513,7 @@
 	int ret, len;
 
 	conf_name = fit_get_name(fit, conf_noffset, NULL);
-	sig_name = fit_get_name(fit, conf_noffset, NULL);
+	sig_name = fit_get_name(fit, noffset, NULL);
 	debug("%s: conf='%s', sig='%s'\n", __func__, conf_name, sig_name);
 
 	/* Get a list of nodes we want to hash */